Remastering of documentation provider

- Remove whole file resolve
- Take already resolved element
- Get kotlin element behind the wrapper directly
- Remove outdated isKotlinDeclaration method
- More tests

idea/testData/editor/quickDoc/TopLevelMethodFromJava.java

@@ -0,0 +1,11 @@
+package server
+
+import some.SomePackage
+
+class Testing {
+    void test() {
+        SomePackage.<caret>foo(12);
+    }
+}
+
+// INFO: <b>internal</b> <b>fun</b> foo(bar: jet.Int): jet.Unit <i>defined in</i> some<br/><p>KDoc foo<br/></p>